Extinction

EXTINCTION         Two-hundred and thirty million years ago the premier(prenominal) dinosaur-like cock roamed the earth. Within five million years it could be considered a dinosaur. They were soon at the top of the food chain. They populate solely(prenominal) continent. Then 65 million years ago they vanished. The nigh powerful creatures ever to live on earth had property in ones chips extinct.         Dinosaurs were not the only victims of this mass extinction. thither were umpteen opposite species that were killed off. During what is cognise as the K-T extinction (K stands for Cretaceous, T stands for Tertiary), many species and families became extinct. These embroil either marine reptiles such as plesiosaurs, mosasaurs, ichthyosaurs, and ammonites, swimming and prompt reptiles, ocean crocodiles, and foraminifera. In addition to that there were many in straitened circumstances(p) fish, sponges, snails, clams, and sea urchins beca me extinct.         Paleontologists make proposed scenarios that could have caused these extinctions. One such scenario involves the outgrowth exposelet of sm tout ensemble mammals which ate dinosaur eggs, and therefore caused the dinosaurs blood set to drop. The birth rate became smaller than the ending rate and the dinosaurs died out. This, however, is not a plausible scenario. This would only account for the dinosaurs, just not all the other creatures of that time.

Paleontologists needed to come up with a much plausible and devastating theory that would overwhelm the other creatures that died out 65 million years ago.         There have been se veral(prenominal) major theories that have c! ome almost that sack all be substantiated. Any one of these events, theorized by paleontologists, could have brought an determination to the dinosaurs and all the other species that died with them. Since there are many theories virtually this I will not write about them all. I have chosen the theory about death by Cosmic Collision (an asteroid).         In 1980 Luis Alvarez... If you want to jump a full essay, order it on our website: OrderEssay.net

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